STATEWIDE UPDATE: New California ADU Bills SB13, AB68, AB881, AB670 have passed. These laws will create more options for building an ADU in Cupertino in 2020. To prepare for the upcoming changes use our ADU Services to learn how these laws will effect your property!
Schedule ADU Consultation (408) 752-5614 ext: 859

Cupertino ADUs

Everything about building Accessory Dwelling Units in Cupertino, CA

Research local zoning codes for ADU design
Calculate returns and costs to get financing
Estimate your project costs and timeline

Check your property to get zoning info & price quotes for ADU feasibility & design services:

I'm interested in

Cupertino ADU Guidelines Last Updated 08/11/19


The city government of Cupertino will approve ADUs under California's statewide mandated regulations.
The California Building Code (CBC) 2016 without amendments is adopted.
Relevant state bill updates for SB13, AB68, AB881, AB670 are shown in green below.


City Hint: The city has not yet responded to requests for ADU permit volumes for the past year, but they will be provided here once response has been received.


Number of ADUs allowed:

One ADU per one primary unit.

AB68 & AB881 Update: Properties which convert existing space to create ADUs may be eligible for one ADU -AND- one JADU.

Types of ADUs allowed:

Attached, detached and junior ADUs allowed.

Lot size:

Per state minimum requirements.

AB68 & AB881 Update: Properties will not be subject to minimum lot standards by ordinance or of the applicable zoning district.

ADU size:

Maximum size of living space is 800 square feet for lots under 10,000 square feet and 1,200 square feet for lots over 10,000 square feet.

AB68 & AB881 Update: Properties will be allowed up to 850 square feet for a one bedroom or up to 1,000 square feet for a two bedroom ADU.


Setbacks are determined by the standards of the underlying zone.

AB68 & AB881 Update: The maximum required setback for a detached new construction ADU shall be no more than 4 feet from the rear or side property lines.


Parking for accessory dwelling unit is not required when converting an existing structure.
One additional off-street parking space shall be provided, if the principal dwelling unit has less than the minimum off-street parking spaces for the applicable residential zoning district in which it is located, as required in Chapter 19.124 unless the unit meets the following requirements:
a. Is within one-half (1/2) mile of a public transit stop; or
b. Located in an architecturally and historically significant historic district; or
c. Occupant of the ADU is not allowed/
offered a required on-street parking permit; or
d. Located within one block of a car share vehicle pick-up location.

If spaces are lost due to the construction of an ADU, they are required to be replaced.

AB68 & AB881 Update: Properties which convert an existing garage will not be subject to replacement parking requirements.

Fire Safety:

Per state minimum requirements.

Shape, materials and style:

Proposed architecture, colors, materials, etc. must be consistent with the main house.


Second-story accessory dwelling units are allowed if the unit: 1. Is a conversion of existing second story portions of the principal dwelling unit; and 2. Complies with applicable landscape requirements to adjoining dwellings consistent with Section 19.28.120 Not allowed for detached ADUs.

Design review:

Ministerial review process per state standards.

Number of Bedrooms:

Not specified by State Standards.


Unit is not intended for sale separate from the primary residence and may be rented. (State requirements)

SB13 Update: Owner-occupancy requirements for ADUs will be voided statewide for 5 years.

Utility connections:

Local health officer approval where a private sewage disposal system is being used, if required. (State requirements)

Permit Fees

SB13 Update: Local impact fees for ADUs will be reduced substantially statewide.


Must have direct outside access without going through the principal dwelling and entrance must be screened from a public street.

Residential Building Code:

The California Building Code (CBC) 2016 without amendments is adopted.

Cupertino City Planning Offices

Cupertino Planning & Zoning

10300 Torre Ave, Cupertino, CA 95014 Cupertino, CA 95014

Featured LenderFinancing

Shawn Sidhu

C2 Financial Corporation

Lic. #CalBRE License #01512335 - NMLS #244238 View Profile

Contact Shawn Sidhu about ADUs in Cupertino. Send a text message:

Cupertino ADU Marketplace

How can I get my ADU built?

Use our ADU Services and Marketplace to get expert assistance, permit-ready ADU designs and on-site contractor estimates on one platform.

Fast and low cost ADU design services

Search local contractors to get estimates

Featured Financing Program

ADU Financing

CA Statewide

Tailored to ADU construction.

Based on project size & appreciation.

Learn how to qualify.

Karyn Jones

Program Representative

Call Now (760) 496-5959

Read Cupertino Housing Market Update

Featured ArticleCupertino, CA

City Council loosens rules for accessory dwelling units 2017-12-28

Featured ArticleCupertino, CA
Featured ArticleCupertino, CA

ADU Guides

ADU Services

A recent customer review:

"I would recommend these services as a cost effective way to begin the serious research necessary to organize an ADU project."

Sharon in Los Angeles, CA

Customer since July, 2018

Learn about ADU Services

Estimate ADU Potential
Costs / ROI


* upon completion of ADU


* based on local average price per sqft


* estimated by location


* 30 years / 5% interest rate / 20% down payment


Appreciation Estimate = (Base Value: $) / (Home's Living Space: sqft) * (ADU's Living Space: sqft)

Rental Estimate = (Rent Per Sqft: $5.04) * (ADU's Living Space: sqft)

How can I get my ADU built?

Our ADU Services and ADU Marketplace provide the fastest and lowest cost way to get started with your ADU project.

How does it work? Get started on your project with expert assistance and without commitment using our customized ADU Property and Design Reports as your first step. Then, get on-site visits from local contractors who can provide you with guidance and estimates for your ADU project.

Our Key Advantages

Compare all the costs and services in one place to find the best fit for your needs and budget

Order ADU zoning research, permit-ready designs and contractor estimates on one platform

Get started on your timeline and your terms, without commitment

The fastest and lowest cost way to get started with your ADU project

Our ADU Process

Expert Feasibility & Zoning Research

Use our ADU Property & Design Reports as a starting point to plan your ADU project. Our experts will do the legwork with your city or county planning office and design custom ADU concepts for your property and your needs.

Find contractors to build your ADU

Use our local contractor database to get on-site visits and cost estimates to compare services for your ADU project.

Getting your designs ready for city permitting and construction can speed up your ADU project and reduce unforseen costs later on in the process.

Check your property to get zoning qualification & price quotes for ADU Services:

Access cost estimates, zoning analysis, design concepts and order ADU Services to get help with feasibility, design and permitting for your ADU project. Check your property to get started!

I'm interested in